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Jürgen, A few great ideas here, thanks!? I'll try the manual and WhatIf order routes - that makes the most sense - and it could just be a market dynamic as well.? Will close the loop after a bit

There's also 985 at https://ninjatrader.com/ninjatrader/TWS/Trader-Workstation-985-1g.exe You can probably guess at other versions.

You can download 981 at https://ninjatrader.com/ninjatrader/TWS/Trader-Workstation-981-3i.exe the TWS release notes ( https://www.interactivebrokers.com/en/index.php?f=1657 )? don't mention a

That email is probably a good start. You could also file a ticket from the account management function when you are logged into your "real" account in the Client Web Portal. I believe "API" was one of

Nothing is impossible, but I somehow cannot convince myself (yet?) that what you see is an issue with TWS API, TWS, or the paper account. Is there any chance that the kind of order you are placing

Jürgen Do you by any chance know how to file a bug report. I sent email at [email protected],? (whatever i found online), but now quite sure if this is the best way to reach developers?

Thanks! I have two questions left: 1) Do you know where I can download safely *older offline* versions? I can't find older versions. 2) How can I see the difference between online and offline

FreeGold, That's the thing, I send a few API requests at setup to get option chain expirations, last underlying prices, and quotes before the first order entry.? I figured things should be good

The FTP site for borrow availability is more like an estimate.? It's not accurate.? Use the API for the correct numbers.

I use the offline versions (stable or latest). They don't update automatically. That way I control when an update happens. I can also have multiple versions installed since each numbered version has

Thank you, I found it in logs! Bid and Ask size a bit too large, but it seems like I need to troubleshoot it separately.

I'd consult TWS/IBGW logs again to check whether only one "Last" message is sent or whether there are multiple that get lost on the client side. Jürgen

To troubleshoot I requested Last price without requesting BidAsk and I see that there are multiple trades every second. I also ran my original code for 250 seconds with the same outcome: one LAST

I just update IBGW to the most recent version: 10.12.2u. The issue is still present. Logs confirm it.

You only get tickByTickLast callbacks when trades actually take place. Looks like your test runs for only 35 seconds and JETS is very lightly traded and can currently have no trades for over a minute.

In these cases, the API log or IBGW client tab are definitely the first place you want to check. Did you try a different version of TWS/IBGW? Jürgen

Thank you so much! I did not realize that I can check logs. From what I see on log (rather Client) tab: 19:05:45:004 -> ---,99-1-3-1661195145-413.05-413.07-1200-1200-0- 19:05:45:004 ->

I am requesting BidAsk and Last price data with?reqTickByTickData. In both requests I set ignoreSize = False. In what arrives I only see one entry for last price and everything else is BidAsk data. I

Have you verified in TWS/IBGW API logs that TWS/IBGW indeed always send the same value for askSize and bidSize in tickByTickBidAsk callbacks for SPY? It would be time for a ticket with IBKR if that is

I am requesting tick-by-tick bid ask data for SPY. In what arrives bid size is always equal to ask size. Is this expected behaviour or a bug? Here is my code: from ibapi.client import EClient from